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MMPB-745B

A system for s izing

and/or concentrating

minerals in slurry

form having variouspart icle size and

density distributions.

High Capacity Classifier

NEWOnly from Erie

Eriez CrossFlow Separator is a highlyefficient hydraulic classifier for the

separation of finely sized materialbased on particle size and/or density.

The hinderedbed concentration method

used in the CrossFlow Separator

provides an economical and efficient

means of sizing material such as sand

and phosphate. Additionally, ores

containing a mixture of high and low

density components can be readily

upgraded based on the difference in

specific gravity. Examples include iron

ore and heavy mineral sands with silica

contamination and runofmine coalcontaining various ashforming

components such as rock and pyrite.

BENEFITS

High capacity (3-9 tph/ft2)

Precise, efficient classification

CrossFlow design eliminates efficiency

losses due to feed water

Easy, online cutpoint control

Fullyautomated discharge controlsystem

Modular construction

CrossFlowrossFlowSeparator

Patent applied for

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PRINCIPLES OF OPERATION

The Eriez CrossFlow Separator uses a

unique tangential feed system to

introduce a mineral slurry that contains

particles of various size and density

into the top of the separation chamber.This novel approach provides capaci-

ties up to three times that of a conven-

tional hydraulic classifier and elimi-

nates errors associated with the

introduction of excess feed water.

Feed particles descend against a rising

flow of teeter water established by a

uniform system of water injection pipes

located in the base of the main separa-

tion housing. Based on the water

addition rate, a fluidized bed of solids

is established in the separator. Par-ticles with a low settling velocity are

carried over the top of the separator

with the fluidizing water. Likewise,

particles that have a density lower than

the teetering bed of solids cannot

penetrate the bed and will also report to

the overflow. High settling rate

particles pass through the teeter bed

into the dewatering cone and are

eventually discharged through the

underflow valve.

Particle size and/or density cutpoint

is controlled by adjustment of the

water flow rate and the level of the

teeter bed. The teeter water addition

and level control systems are fully

instrumented. The underflow dis-

charge rate is regulated using an

automated electronic control system

consisting of a pressure gauge, PID

loop controller and pneumatically

actuated control valve.

CrossFlow Separator

The Eriez CrossFlow Separator consists

of a tangential feed system, main housing

(separation zone and dewatering cone),

product collection launder, water injection

system and process control system.

Consult Eriez to custom design a

CrossFlow Separator to suit your

specific product application.

UNDERFLOWDISCHARGE

OVERFLOWDISCHARGE

FEEDINLET

WATER

INJECTION

FINE/LOW DENSITYPARTICLES

TEETER BEDINTERFACE

COARSE/HIGH DENSITYPARTICLES

CONTROLLER

SENSOR

DISCHARGEVALVE

WATERINLET

INLET &RETURNHEADERS

Eriez and Eriez Magnetics are registered trademarks of Eriez Manufacturing Co. 2003 ERIEZ MAGNETICS ALL RIGHTS RESERVED

World Authority in Advanced Technology for Magnetic, Vibratory and Metal Detection ApplicationsHEADQUARTERS: 2200 ASBURY ROAD, P.O. BOX 10608, ERIE, PA 16514-0608 U.S.A.

Telephone 814/835-6000 800/345-4946 Fax 814/838-4960 International Fax 814/833-3348

Web Site: http://www.eriez.com e-mail: eriez@eriez.com

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